# how open an electrical circuit when a mercury sensor detects movment [closed]

i'm a 12th grade student and our school has a safe competition, which means we need to build a safe that you can open with the laws of physics. we have a pendulum and we don't want it to move if someone is tilting the safe, so we want to make a "defense mechanism" against it, so i want to detect if someone moved the circuit and i have a mercury sensor. the circuit i want to build shuts off an other circuit powered by a 9 volt battery that contains a single electric motor for 3 seconds if someone moved it. how does the circuit looks like? i don't have any size constraints, i can store it and make it as big as needed.

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Not really enough information to answer. Depends on the circuit are you trying to shut off. eg - Are you looking to interrupt power to a circuit for 3s or just have a microcontroller do nothing for 3s. –  spearson Mar 13 '12 at 18:30
interrupt power to a different circuit for 3s... –  Someonation Mar 13 '12 at 18:41
How much power are you talking about? voltage? size constraints? We need a lot more info. –  Kellenjb Mar 13 '12 at 18:43
i want to interrupt a 9 volt battery powered circuit... what do you mean by size constraints? how many resistance is in the circuit? about 9 ohm. i'm sorry i don't know what information you need... i'm kind of a newbie –  Someonation Mar 13 '12 at 18:49
By size constraints I mean do you have any limitation on physically how big the circuit can be. As far as power and voltage I am talking about what it is you are switching. The schematic would be very different for a 120VAC circuit then it would be for a 9V battery. Also would be very different if it is powering a motor or if it is powering a single LED. Please update your question with all of this type of info so that people don't have to read through comments to figure out what you are doing? –  Kellenjb Mar 13 '12 at 19:01

## closed as not constructive by Kevin VermeerApr 12 '12 at 13:43

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